I love the expansion,but I hated the quest, so I figured out a way to finish it fast.Spoiler:
1.Exit beginning dungeon, if you have not already. 2.Press ~ and type "coc testinghall" without quotes. 3. Turn left from the point you enter and you should find the weapons room, enter. 4. Pick up the Sword, or Mace of the crusader, then pick up the shield (If you pick up the shield first it will start you from the part you get the shield.) 5.When you pick up the Sword or the Mace it should say "I have found all the artifacts of the crusader" (IDK I only tried it with the sword only.) 6. Exit the room, and one of the rooms next is the armor room, go in there and pick up the armor, make the quest you started when you picked up the Sword or mace as your active quest exit through the door, and find the door that says to Hawkhaven, then follow your to your destination. You will receive instructions there.
Finish Knights of the Nine quest quick.(If you have not started
You need the GOTY version to do this because you need console commands. With this you can finish the quest in less than an hour, or an hour and a half. You need to finish the beginning dungeon for this to work. Press ~, type "coc testinghall" (not case sensitive and without quotes) you will appear in a room full of doors. Explore, you will find a room that say something like "Weapons warehouse" go in and find the Sword of the Crusader, or the Mace Of The Crusader pick it up and it will have a quest box appear and say you have all the artifacts. Exit the room, and there will be another room called "Armor Hall" go in and pick up all the Relics of the crusader (Helmet Cuirass etc.) follow the quest instructions and your done, have fun with the Knights of the Nine armor.